Chrome Dokuro is a 13 year old school girl dressed in Kokuyo School uniform, she first appears when she is revealed as Tsuna's mystery Mist Guardian. She is a generally shy person, often locking herself in her room and not talking to the others. When she first joined the Vongola Family she appeared commited and loyal to Tsuna, her reasoning was later revealed. Tsuna was the only connection she had to Mukuro Rokudo. During her battles she fights to the best of her ability, constantly putting her life on the line due to her fragile health, often relying for Mukuro to give her more power. However in the future arc Mukuro was beaten by Byakuran and she had to fight without his help, only to find she is a rather powerful illusionist. It was unknown if it were her of Mukuro that were chosen as the Official Mist Guardian in the Future due to Chrome and Mukuro sharing the same body, although later on it as revealed that it was Chrome that was chosen. Her name; Chome Dokuro is an anogram on Mukuro Rokudo. Before Mukuro saved her life her name was Nagi.

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In a flashback her parents talk about Chrome as an anti-socialist and was went by the name Nagi. Whilst trying to save a at from harm she was hit by a car which led to the loss of her right eye and several of her internal organs. The only way she would have been saved were if someone of the same blood type gave her their organs. She had seemingly given up on life, her parents didn't care enough for her; her mother refused to give her own organs and didn't care if she lived or died. However, Mukuro allowed her to live by giving her illusionary organs. The cost of this is if either hers or Mukuro's trident breaks, her stomach will lapse due to lack of any genuine organs. She is shown to have learnt 2 of the 6 skills used by Mukuro. She also wishes to learn Italian as she wants to be able to talk to Mukuro in his native language.

Since her and Mukuro share the same body she has the power of "Six Paths of Reincarnation", although she is proficient in making illusions and summoning animals. During the Future Arc she learns how to create 'real illusions' using the Mist Vongola Ring.